Digital radio mondiale receiver integer carrier frequency offset estimation
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United States of America Patent
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-
Sep 18, 2012
Grant Date -
Nov 13, 2008
app pub date -
Mar 28, 2008
filing date -
Mar 29, 2007
priority date (Note) -
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Abstract
A method and apparatus for estimating a carrier frequency offset (CFO) in a Digital Radio Mondiale receiver is provided. Orthogonal frequency-division multiplexing (OFDM) demodulation is performed on a received DRM signal to produce OFDM symbols. A cell characteristic in corresponding cells in the OFDM symbols is compared and a carrier index of a frequency pilot cell in the cells is identified based upon the compared cell characteristic. The CFO is estimated based on the identified carrier index of the frequency pilot cell. The ratio of values of the cell characteristic in corresponding cells may be calculated and the frequency pilot cell identified by identifying cells for which the cell characteristic is most nearly equal. The CFO may be estimated by comparing the identified carrier index with an expected carrier index of a frequency pilot cell.
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